Actually i also don't have an 1993 Mongoose catalogue, just a bit from other years.
However, I've checked the line-up in a German buyers guide for 1993. No fit, the Rockadile SX 1993 was black and came with the Duo Track, but from what i can see from the small picture, haven't had a monostay.
In 1994 the IBOC Pro was partly carbon, but already 1992 and 1993 the IBOC Pro was build with Aluminium frame with iconic triangular (Toblerone) tob tube.
Yours not.
Just a guess, maybe it's even older?
Color and frame-wise the 1991 IBOC Pro would be a good fit
View attachment 633906
This red variant was also discovered as 1991 model:
https://www.retrobike.co.uk/threads/1993-mongoose-iboc-pro.193976/page-3
With that theories, the decals must have been replaced at a certain point of time, like 93/94 with newer ones, so also the fork. This duo track came indeed just with cheaper models like Rockadile or Hilltropper.
At least also the DX thumb shifter would be than original, because DX was stopped already 1992.
Still a bit of a confusing Bike